The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 1986
Filed:
Aug. 08, 1983
Applicant:
Inventors:
Izumi Ichikawa, Yokohama, JP;
Hideaki Sato, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 45 ; 369124 ; 369100 ; 369175 ; 360 65 ; 250201 ;
Abstract
An optical information processing method and an apparatus therefor for information recording on or information readout from a recording medium by converging a light beam onto the recording medium, in which the wave form equalization characteristic of the signal upon information recording or information readout is controlled in accordance with the information on the state of focus of the light beam on the recording medium.